Olivia, Mobilized for War 248/297 (The List Reprints)

Flying Whenever another creature you control enters, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types.

NM - $5.80
LP - $4.60
MP - $3.50
HP - $2.30
DMG - $2.20